How to properly "switch off"? LE10.0.2 + KODI 19.4 on RPi4B 2GB (only Wifi, no LAN) + Kore v2.5.3 + Samsung TV (with CEC)

DIY-Enthusiast · June 30, 2022 at 6:54 PM

Cheers,

first timer here, have recently installed LibreELEC/KODI on my RPi4 and am having a good time, though sometimes I stumble over stuff I just don't know (like adjusting Kodis volume via my phones volume buttons).

My question is the following: How do i shut down my TV via the Kore app without shutting down my Kodi/LibreELEC/RPi4?

Why this matters: Currently the only ways to shutdown my TV via LibreELEC are

- a) by issuing a CEC command on CLI, quite inconvenient.

- b) by shutting down LibreElec/Kodi/RPi. This is not acceptable in my use case, as i am not able to Wake-On-LAN my RPi4. (Kore tries it, but to no avail as the RPi4 is only connected via WiFi)

Also: This installation of LibreELEC only seems to allow the power mode switches "Shutdown" and "Restart" (and some very esoteric stuff). Even in "Expert" mode I am not allowed to change the "Shutdown function" in the configuration "System".

Any tips on how I could achieve a "Shutdown TV only" power mode or a similar solution?

P.S.: Also open to hints how to get Wake-on-Wifi working with LibreELEC. AFAIK that's just not possible with my firmware.

TomB19 · June 30, 2022 at 8:43 PM

I'm about to get blasted, down-voted, and perhaps banned from the site but I connect the rPi to a switched output on the AVR.

If I can find a better way, I will jump on it.

ghtester · July 1, 2022 at 3:57 AM

As RPi has GPIO outputs, I am using 2 different methods.

1) relay switching the power outlet for TV, controlled by GPIO & python script, mapped to IR remote button. It can turn on / off TV. Needs a high voltage circuit building so it's dangerous for unexperienced persons.

2) IR transmit circuit, controlled by GPIO & python script, mapped to IR remote button. It can send any IR command to TV including power on / power off. Easy to build, more universal & safe as it's only low voltage circuit. Needs an IR receive sensor as well for scanning necessary IR commands from the IR remote.

If CEC works fine with your TV, you can also map the appropriate script to some remote button so it could be a best solution for you (don't know Kore but I suppose it could allow that).

DIY-Enthusiast · July 1, 2022 at 9:21 AM

Cheers guys, thank you for the suggestions.

As everything else is working fine and all the necessary technological foundations have been shown to practically work well, i would like to not tinker around with extra cables and IR remotes.

If you could e.g. point me to the conf-files that map the powermodes to the executed commands on power switches that might allow me to fix this myself. Sadly i couldn't find that info myself.

ghtester · July 1, 2022 at 12:55 PM

Look here and give it a try: Execute script from remote

Another example using the keyboard.xml instead: Power off options

My solution is different and I don't use Kore app so I don't know how it works and what commands are currentlyt allowed to be put into .xml files but you may try.

DIY-Enthusiast · July 1, 2022 at 9:41 PM

Hey ghtester, thank you for the suggestions.

1. Is about what i would like to do, i would just omit "systemctl stop kodi" of "off.sh". There's just no way i have found to issue a keystroke via Kore nor how to map this behind the buttons in the shutdown menu.

2. Basically has the same caveat as 1. no known way to issue a keystroke via Kore.

I have sifted a bit through the code of Kore and it seems to me that Kore just sends commands to Chorus that are defined in this file, compare:

Code: in /usr/share/kodi/addons/webinterface.default/js/kodi-webinterface.js

          return function(action) {
            switch (action) {
              case 'quit':
                App.request("command:kodi:controller", 'auto', 'Application').quit();
                break;
              case 'shutdown':
                system.shutdown();
                break;
              case 'reboot':
                system.reboot();
                break;
              case 'suspend':
                system.suspend();
                break;
              case 'hibernate':
                system.hibernate();
                break;
            }

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How I would replace one of those with the execution of a script that does something like

kodi-send --action="PlayerControl(Stop)";echo "standby 0" | cec-client -s -d 1"

i don't know.

ghtester · July 1, 2022 at 11:32 PM

I can't test if it works but I would try to modify the files like:

/usr/share/kodi/addons/webinterface.default/js/kodi-webinterface.js (lines between 14172 - 14189)

Code

          return function(action) {
            switch (action) {
              case 'quit':
                App.request("command:kodi:controller", 'auto', 'Application').quit();
                break;
              case 'shutdown':
                System.Exec("/storage/off.sh")
                break;
              case 'reboot':
                system.reboot();
                break;
              case 'suspend':
                system.suspend();
                break;
              case 'hibernate':
                system.hibernate();
                break;
            }

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/storage/off.sh

Bash

#!/bin/bash

kodi-send --action="PlayerControl(Stop)"   
echo "standby 0" | cec-client -s -d 1

Don't forget to make the script file executable:

Code

chmod +x /storage/off.sh

DIY-Enthusiast · July 7, 2022 at 5:59 PM

Thank you for the encouragement and pushing me in the right direction!

It might be as easy as putting "System.exec" in there. For now i am not getting any further as:

/usr/share/kodi/addons/webinterface.default/js/kodi-webinterface.js

is on a read-only filesystem.

Currently i am trying to find out how LibreELEC is mounting filesystems whatsoever, as fstab is empty.

EDIT: OK, LibreELEC uses udevil, and i have seen that there are conf files and that i could mount manually, but for now i am not able to find out for this file a) on which filesystem it is and b) where that filesystem is mounted from.

EDIT2: Ok, i have found this. Device seems to be read-write mounted, maybe the filesystem is not.

Code

LibreELEC:/ # udevil info /dev/disk/by-label/STORAGE
Showing information for /org/freedesktop/UDisks/devices/mmcblk0p2
  ...
  has media:                   1
  is read only:                0
  is mounted:                  1
  mount paths:                 /storage
 ...
  label:                       STORAGE

Maybe i there is a way to just mount this a bit differently?

**chewitt** · July 8, 2022 at 8:48 AM

Add-ons in /usr/share/kodi/addons/webinterface.default/js/kodi-webinterface.js are part of the squasfs SYSTEM file that we mount on each boot. If you want to modify the content of that add-on you need to patch the add-on sources and then (re)compile the change into a new LE image. Bedtime reading:

https://wiki.libreelec.tv/development-1/build-basics

https://wiki.libreelec.tv/development-1/git-tutorial